GrimmSpeed StealthBox Cold Air Intake Red 2015-2021 STI

Upgrade your 2015-2021 Subaru WRX STI with the GrimmSpeed StealthBox Cold Air Intake, designed to enhance performance while maintaining a clean engine bay look. This intake combines the benefits of both cold air and short ram designs, delivering improved airflow and throttle response for enthusiasts seeking reliable power gains.

Featuring a hybrid cold air/short ram design, the StealthBox includes an air straightener that mimics factory airflow for accurate MAF sensor readings. The MAF sensor is mounted inside the TIG-welded heat shield, isolating it from engine heat to ensure consistent performance. The custom high-flow reusable filter with an integrated velocity stack maximizes airflow while protecting your engine. Made in the USA, installation takes about 30 minutes with detailed written and video guides included.

Ideal for Subaru WRX STI owners who want a premium intake upgrade, this kit requires tuning for optimal results and is not compatible with stock or off-the-shelf maps. Elevate your ride’s performance and style—shop the GrimmSpeed StealthBox at Subimods today.